Java Patching at Incident Speed: Lessons from the eMudhra CA Compromise
Browsers blocked the compromised eMudhra CA keys in hours. Learn why Java estates lag, and how security-only Java patching cuts testing and …
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Foojay is the vendor-neutral home for the Java community with daily news, OpenJDK data, podcasts and guides, made by the developers who use it. What is Foojay? →
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Spring AI or LangChain4j? One App, Three Stacks, One Test
The same small AI service in Spring AI, LangChain4j on Spring Boot and on Quarkus, held to one shared test. Where they differ, and where …
Streaming Large File Uploads in Java Without Killing Your Server
Spring's @RequestPart cannot stream multipart uploads — not even FilePart. The API that actually does, and the tests that prove it.
Free Java Diagnostic Tool
A 20-second local scan of every JDK on your machine, checked against the latest patch levels. No agent, no install, no data leaves your network.
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Welcome to the new Foojay!
The same content from amazing Java developers, now in a new home. Foojay has been rebuilt from the ground up!
OCX Webinar Week: a first look at OCX27
Five days of live webinars on 2-6 November on AI agents, Jakarta EE, code signing, embedded systems and more. Join live for €50 off an OCX27 early bird ticket.
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Free eBook: Sustainability for Java Developers
Towards an understanding of sustainable software development, written by and for the friends of OpenJDK
Your GPU spend is optimized. Your JVM probably isn’t.
Hidden JVM inefficiencies - GC pauses, conservative JIT, slow warm-up - are quietly draining your AI infrastructure's performance and cloud spend. This guide shows how to eliminate that drag and scale with fewer nodes.
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dukehoff-decide: Typed, Calibrated Decisions from Small Language Models
Many LLM calls in Java apps are multiple choice. dukehoff-decide answers them with a small local model and returns a typed value with …
From Google Drive to Syncthing over Tailscale
Why my KeePass database left Google Drive, and how Syncthing over a Tailscale mesh syncs it between a Synology NAS, a Mac, an iPhone, and an …
Spring Boot's Hidden Secret for Configuration: EnvironmentPostProcessor
How to ship default configuration from a shared Spring Boot starter so services can still override it.
CheerpJ 5.0: Java 21/25 in the browser, full OpenJDK, and a new WasmGC engine
CheerpJ 5.0 brings Java 21 and 25, a complete OpenJDK build, and an experimental WasmGC execution engine to the browser.
Context Is a Budget: What Changed in Our Team's Process When We Started Using AI Coding Agents
A practical, tool-agnostic workflow for specs, tests, review loops, worktrees, and team-owned configuration when coding agents join …
New on Foojay: Television, Statistics, Java Conferences, Coming Soon and Week in Review
Five new pages on foojay.io: Java videos from YouTube, the numbers behind Foojay, a map of Java conferences, a peek at the articles that are …
No Quote, No Claim: Making an LLM Show Its Sources in Java
My job portal asks Gemini why a job fits a candidate. Every claim must quote its source, and a few lines of plain Java drop any quote that …
Building a GlassPaneBase Control in JavaFX
How to implement a reusable glassmorphism surface in JavaFX using the Control–Skin architecture.
Featured Foojay Authors for November 2026: Geertjan Wielenga and Ricardo Mello
Our Featured Authors for November are Geertjan Wielenga and Ricardo Mello. Here is what they write about, and where to start reading.
91 viewsFoojay Podcast #104: 53 CVEs, Two Emergency Releases: Why Java Security Holds Up with Simon Ritter
A record 53 CVEs and two out-of-cycle releases in one week. Simon Ritter explains what happened, why Java security holds up, and how to stay …
Foojay Podcasts
Catch up on the most recent episodes and stay updated with the latest OpenJDK innovations.
91 viewsFoojay Podcast #104: 53 CVEs, Two Emergency Releases: Why Java Security Holds Up with Simon Ritter
A record 53 CVEs and two out-of-cycle releases in one week. Simon Ritter explains what happened, why Java security holds up, and how to stay …
163 viewsFoojay Podcast #103: Killing Reflection at Build Time with Dmitry Moskalyuk and Shai Almog
A backend data layer and a cross-platform UI framework both moved reflection to build time. Dmitry Moskalyuk and Shai Almog explain why, and …
257 viewsFoojay Podcast #102: Why Foojay Walked Away From WordPress for Static Sites
Foojay walked away from WordPress after six years. Andy Damevin and Holly Cummins join to weigh CMS security and cost against Hugo, Jekyll …
503 viewsFoojay Podcast #101: Java 27 in Practice: Smaller Heaps, Smarter Defaults, and Valhalla on the Horizon
Simon Ritter on JDK 27: compact object headers, G1 everywhere by default, post-quantum TLS, monthly security updates, and Valhalla's first …
Happening in the next two weeks
Meetups from Java User Groups worldwide, plus the conferences and workshops on the calendar.
- 2–6 Nov W-JAX
- 2–6 Nov OCX Webinar Week 2026
- 4–5 Nov Devoxx Morocco
- 4–6 Nov Øredev
- 5–6 Nov Heapcon
- 5 Nov Amsterdam JUG Meetup at Atlassian
- 5 Nov I Quit BDD Once. This Time the AI Writes the Glue
- 5 Nov ⚡️Présentations éclairs de la communauté / Lightning Talks
- 7 Nov Going to DevFest Vienna
- 7 Nov JUG DA: Global Day of Code Retreat Frankfurt
- 9 Nov An Evening about Event Sourcing by Ted M. Young (+ Lightning Talk)
- 9 Nov From JDBC to Database Control Planes: 30 Years of Java Database Connectivity by Rogerio Robetti
- 10 Nov Porto Tech Hub
- 9 Nov Bootiful Spring Security
- 10 Nov November 2026: Kotlin-Powered Spring Boot and the Security of LLMs
- 10 Nov Event Sourcing without ORMs – Ted M. Young
- 11–12 Nov J-Fall
- 11 Nov Utrecht JUG Meetup – Nov 11: Java Security & Agentic AI in Legacy Modernization
- 11 Nov Neuerungen in Java und Open Source Finanzierung
- 11 Nov JUGO - TBD - save the date
- 11 Nov From Code to Context – Wie KI Softwaresysteme wirklich verstehen kann
- 12 Nov Mit Java, ohne kommerzielle LLMs, KI Aufgaben erkennen und lösen
- 12 Nov LJC Meetup at Capital One
- 12 Nov Java 26 and 27 in the Trenches: New Features and the Art of Staying Current
- 14 Nov Global Day of Coderetreat
- 16 Nov November Meetup
- 16 Nov JUG BB: Pre-SAG Special @ JetBrains with Chris Richardson
- 17 Nov Amsterdam JUG Meetup at Flagsmith
- 17 Nov JUG Bonn #51: Architekturen verständlicher machen & Property-Based Testing
- 17 Nov Lightning Talks ⚡
- 17 Nov Backend Entwicklung mit Rust
- 17 Nov Knowns and Unknowns: Testing AI-Generated Code
- 17 Nov Next-level AI: Upgrade your skills with agents, MCP, and more
- 18–19 Nov ASF Community Over Code / ChurConf
- 18 Nov Deterministic Java refactoring at scale + Snake in 10 lines
- 18 Nov Post-Quanten-Kryptographie und Java: Hintergrund, Risiken, Handlungsbedarf
- 19 Nov JUG DA: ADHS in der IT: Vom Chaos zum Code (Joshua Töpfer)
- 19 Nov Spring-Boot-Anwendungen testen - Ein Blick hinter den Vorhang (Michael Vitz)
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